Re: [PATCH RFC v3 01/35] mm: page_alloc: Add gfp_flags parameter to arch_alloc_page()
Hi, On Tue, Jan 30, 2024 at 09:56:10AM +0530, Anshuman Khandual wrote: > > > On 1/29/24 17:11, Alexandru Elisei wrote: > > Hi, > > > > On Mon, Jan 29, 2024 at 11:18:59AM +0530, Anshuman Khandual wrote: > >> On 1/25/24 22:12, Alexandru Elisei wrote: > >>> Extend the usefulness of arch_alloc_page() by adding the gfp_flags > >>> parameter. > >> Although the change here is harmless in itself, it will definitely benefit > >> from some additional context explaining the rationale, taking into account > >> why-how arch_alloc_page() got added particularly for s390 platform and how > >> it's going to be used in the present proposal. > > arm64 will use it to reserve tag storage if the caller requested a tagged > > page. Right now that means that __GFP_ZEROTAGS is set in the gfp mask, but > > I'll rename it to __GFP_TAGGED in patch #18 ("arm64: mte: Rename > > __GFP_ZEROTAGS to __GFP_TAGGED") [1]. > > > > [1] > > https://lore.kernel.org/lkml/20240125164256.4147-19-alexandru.eli...@arm.com/ > > Makes sense, but please do update the commit message explaining how > new gfp mask argument will be used to detect tagged page allocation > requests, further requiring tag storage allocation. Will do, thanks! Alex
Re: [PATCH RFC v3 01/35] mm: page_alloc: Add gfp_flags parameter to arch_alloc_page()
On 1/29/24 17:11, Alexandru Elisei wrote: > Hi, > > On Mon, Jan 29, 2024 at 11:18:59AM +0530, Anshuman Khandual wrote: >> On 1/25/24 22:12, Alexandru Elisei wrote: >>> Extend the usefulness of arch_alloc_page() by adding the gfp_flags >>> parameter. >> Although the change here is harmless in itself, it will definitely benefit >> from some additional context explaining the rationale, taking into account >> why-how arch_alloc_page() got added particularly for s390 platform and how >> it's going to be used in the present proposal. > arm64 will use it to reserve tag storage if the caller requested a tagged > page. Right now that means that __GFP_ZEROTAGS is set in the gfp mask, but > I'll rename it to __GFP_TAGGED in patch #18 ("arm64: mte: Rename > __GFP_ZEROTAGS to __GFP_TAGGED") [1]. > > [1] > https://lore.kernel.org/lkml/20240125164256.4147-19-alexandru.eli...@arm.com/ Makes sense, but please do update the commit message explaining how new gfp mask argument will be used to detect tagged page allocation requests, further requiring tag storage allocation.
Re: [PATCH RFC v3 01/35] mm: page_alloc: Add gfp_flags parameter to arch_alloc_page()
Hi, On Mon, Jan 29, 2024 at 11:18:59AM +0530, Anshuman Khandual wrote: > > On 1/25/24 22:12, Alexandru Elisei wrote: > > Extend the usefulness of arch_alloc_page() by adding the gfp_flags > > parameter. > > Although the change here is harmless in itself, it will definitely benefit > from some additional context explaining the rationale, taking into account > why-how arch_alloc_page() got added particularly for s390 platform and how > it's going to be used in the present proposal. arm64 will use it to reserve tag storage if the caller requested a tagged page. Right now that means that __GFP_ZEROTAGS is set in the gfp mask, but I'll rename it to __GFP_TAGGED in patch #18 ("arm64: mte: Rename __GFP_ZEROTAGS to __GFP_TAGGED") [1]. [1] https://lore.kernel.org/lkml/20240125164256.4147-19-alexandru.eli...@arm.com/ Thanks, Alex > > > > > Signed-off-by: Alexandru Elisei > > --- > > > > Changes since rfc v2: > > > > * New patch. > > > > arch/s390/include/asm/page.h | 2 +- > > arch/s390/mm/page-states.c | 2 +- > > include/linux/gfp.h | 2 +- > > mm/page_alloc.c | 2 +- > > 4 files changed, 4 insertions(+), 4 deletions(-) > > > > diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h > > index 73b9c3bf377f..859f0958c574 100644 > > --- a/arch/s390/include/asm/page.h > > +++ b/arch/s390/include/asm/page.h > > @@ -163,7 +163,7 @@ static inline int page_reset_referenced(unsigned long > > addr) > > > > struct page; > > void arch_free_page(struct page *page, int order); > > -void arch_alloc_page(struct page *page, int order); > > +void arch_alloc_page(struct page *page, int order, gfp_t gfp_flags); > > > > static inline int devmem_is_allowed(unsigned long pfn) > > { > > diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c > > index 01f9b39e65f5..b986c8b158e3 100644 > > --- a/arch/s390/mm/page-states.c > > +++ b/arch/s390/mm/page-states.c > > @@ -21,7 +21,7 @@ void arch_free_page(struct page *page, int order) > > __set_page_unused(page_to_virt(page), 1UL << order); > > } > > > > -void arch_alloc_page(struct page *page, int order) > > +void arch_alloc_page(struct page *page, int order, gfp_t gfp_flags) > > { > > if (!cmma_flag) > > return; > > diff --git a/include/linux/gfp.h b/include/linux/gfp.h > > index de292a007138..9e8aa3d144db 100644 > > --- a/include/linux/gfp.h > > +++ b/include/linux/gfp.h > > @@ -172,7 +172,7 @@ static inline struct zonelist *node_zonelist(int nid, > > gfp_t flags) > > static inline void arch_free_page(struct page *page, int order) { } > > #endif > > #ifndef HAVE_ARCH_ALLOC_PAGE > > -static inline void arch_alloc_page(struct page *page, int order) { } > > +static inline void arch_alloc_page(struct page *page, int order, gfp_t > > gfp_flags) { } > > #endif > > > > struct page *__alloc_pages(gfp_t gfp, unsigned int order, int > > preferred_nid, > > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > > index 150d4f23b010..2c140abe5ee6 100644 > > --- a/mm/page_alloc.c > > +++ b/mm/page_alloc.c > > @@ -1485,7 +1485,7 @@ inline void post_alloc_hook(struct page *page, > > unsigned int order, > > set_page_private(page, 0); > > set_page_refcounted(page); > > > > - arch_alloc_page(page, order); > > + arch_alloc_page(page, order, gfp_flags); > > debug_pagealloc_map_pages(page, 1 << order); > > > > /* > > Otherwise LGTM.
Re: [PATCH RFC v3 01/35] mm: page_alloc: Add gfp_flags parameter to arch_alloc_page()
On 1/25/24 22:12, Alexandru Elisei wrote: > Extend the usefulness of arch_alloc_page() by adding the gfp_flags > parameter. Although the change here is harmless in itself, it will definitely benefit from some additional context explaining the rationale, taking into account why-how arch_alloc_page() got added particularly for s390 platform and how it's going to be used in the present proposal. > > Signed-off-by: Alexandru Elisei > --- > > Changes since rfc v2: > > * New patch. > > arch/s390/include/asm/page.h | 2 +- > arch/s390/mm/page-states.c | 2 +- > include/linux/gfp.h | 2 +- > mm/page_alloc.c | 2 +- > 4 files changed, 4 insertions(+), 4 deletions(-) > > diff --git a/arch/s390/include/asm/page.h b/arch/s390/include/asm/page.h > index 73b9c3bf377f..859f0958c574 100644 > --- a/arch/s390/include/asm/page.h > +++ b/arch/s390/include/asm/page.h > @@ -163,7 +163,7 @@ static inline int page_reset_referenced(unsigned long > addr) > > struct page; > void arch_free_page(struct page *page, int order); > -void arch_alloc_page(struct page *page, int order); > +void arch_alloc_page(struct page *page, int order, gfp_t gfp_flags); > > static inline int devmem_is_allowed(unsigned long pfn) > { > diff --git a/arch/s390/mm/page-states.c b/arch/s390/mm/page-states.c > index 01f9b39e65f5..b986c8b158e3 100644 > --- a/arch/s390/mm/page-states.c > +++ b/arch/s390/mm/page-states.c > @@ -21,7 +21,7 @@ void arch_free_page(struct page *page, int order) > __set_page_unused(page_to_virt(page), 1UL << order); > } > > -void arch_alloc_page(struct page *page, int order) > +void arch_alloc_page(struct page *page, int order, gfp_t gfp_flags) > { > if (!cmma_flag) > return; > diff --git a/include/linux/gfp.h b/include/linux/gfp.h > index de292a007138..9e8aa3d144db 100644 > --- a/include/linux/gfp.h > +++ b/include/linux/gfp.h > @@ -172,7 +172,7 @@ static inline struct zonelist *node_zonelist(int nid, > gfp_t flags) > static inline void arch_free_page(struct page *page, int order) { } > #endif > #ifndef HAVE_ARCH_ALLOC_PAGE > -static inline void arch_alloc_page(struct page *page, int order) { } > +static inline void arch_alloc_page(struct page *page, int order, gfp_t > gfp_flags) { } > #endif > > struct page *__alloc_pages(gfp_t gfp, unsigned int order, int preferred_nid, > diff --git a/mm/page_alloc.c b/mm/page_alloc.c > index 150d4f23b010..2c140abe5ee6 100644 > --- a/mm/page_alloc.c > +++ b/mm/page_alloc.c > @@ -1485,7 +1485,7 @@ inline void post_alloc_hook(struct page *page, unsigned > int order, > set_page_private(page, 0); > set_page_refcounted(page); > > - arch_alloc_page(page, order); > + arch_alloc_page(page, order, gfp_flags); > debug_pagealloc_map_pages(page, 1 << order); > > /* Otherwise LGTM.